Tool-holder.



PATENTED MAY 7, 1907.

UNITED STATES PATENT orrron.

Specification of Letters Patent.

Patented May 7, 1907.

Application filed January 7, 1907. Serial No. 351,106.

To all whom it may. concern:

Be it known that I, DAVID CRAIG, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Improvement in Tool-Holders, of which the following isa specification.

The invention relates to a holder for the cutting and planing tools employed on a lathe or planer and the objects of the improvement are to provide a holder into and from which the tool can be readily inserted and removed, and when inserted so that it can be readily adjusted to meet the requirements of the work and when so held firmly and rigidly against any move ment or vibration. These objects are attained by the construction, mechanism and arrangement illustrated in the accompanying drawing, in which- Figure 1 is a perspective view of the tool holder with a short post as applied to a lathe carriage; Fig. 2, a side elevation of the holder with a long post as applied to a planer carriage Fig. 3, a detached perspective view of the tool holder with a short post; Fig. 4, a detached perspective view of the under side of same showing the post-head disengaged for adjustment; and Fig. 5, a detached per spective View of the extension collar for use with the long post.

Similar numerals refer to similar parts throughout the drawing.

The tool holder proper is composed of the horizontally disposed and preferably rectangular stock 1 which is of considerably greater depth than its width, with the preferably cylindrical head 2 formed on the lower half or part of the forward end; the vertically disposed round post 3 or 3 adapted to fit and be held in the similar axial aperture 4 in the head of the holder; and the screw 5 adapted to be turned into the threaded axial bore 6 in the upper end of the post.

en employed in a lathe the holder is attached in the usual manner on the carriage 7 by means of the lathe-post 8, the concave collar 9, the adjustable rest 10 and the post screw 1 1 and when employed in a planer the holder is attached in the usual manner on the carriage 7 by means of the planer-post 8 the collar 9 and the post screw 11".

The lower sides of the holder-stock and head are formed in the same plane, so that in the various adjustments the head as well as the stock will rest wholly or partly on the adjusted is I lathe adj ustable-rest or the planer rest-collar, thus giving the tool a firm and rigid support in theperformance of its work. like head 12 is provided on the lower end of the holder-post and in the periphery of this head are provided the numerous, preferably Vshaped, notches 13. The counter-sink 14 is provided in the under side of the holderhead, and is adapted to receive the posthead so that the lower face thereof will be flush with the lower side of the holder-head; and in one side'of the countersink is provided the preferably V-shaped lug or tooth 15, which is adapted to enter in the various notches in. the periphery of the post-head. By this construction and arrangement the post can be rotatably adjusted by merely disengaging the notches of its head from the lug in the counter-sink of the holder-head, as shown in Fig. 4; but when the post is suitably adjusted and its head is seated in the counter-sink, the engagement of the lug in the notches holds the post rigidly against rotation.

The diametrically disposed longitudinal slot 16 is provided in the holder post, which slot is adapted to neatly but freely receive the shanks 17 of the various cutter-blades, and when the blade shank is inserted in the slot the parts are held rigidly in proper place by turning the holder-screw 5 against the upper edge of the blade-shank, as shown by broken lines in Fig. 3. The comparatively narrow groove 18 is provided in the upper side of the post-slot, which groove is adapted to receive the relatively thin upper edge of a cutting-off blade 19 as shown in Fig. 1, and when such a blade is used the thin lower edge thereof is adapted to be entered into one of the diametrically disposed grooves 20 formed in the upper face of the holder-head, by which means the cutting-off blade is rigidly held against lateral or twisting movement; and, as before, the blade and the holder parts are securely and rigidly held together by turning the holder-screw against the upper edge of the cutting-off blade, as shown by broken lines in Fig. 1.

For use on a planer, the long post 3 and the extension collar 2" are preferably used, so that the cutter-blade is located above the upper side of the holder-stock and can be freely rotated in its various adjustments, as shown in Fig. 2; and the upper face of the extension collar is provided with the diamet rically disposed grooves 20 as in the upper face of the 'holder-head, for receiving the lower edge of a thin cutting-off blade. And the upper faces of the holder-head and the extension collar are preferably provided with the annular grooves 21, having sharp edges, which serve to increase the friction against the lower edges of the blades.

It will be noted that by the peculiar construction and arrangement of the parts of the holder, thus described, the lower faces of the holder and its head and also the lower end of the holder-post, are all located in the same plane, as shown especially in Fig. 2, so that the holder can be freely adjusted to bring its head and post partly or entirely on the sup porting adjustable-rest or collar of the lathe or planer carriage, by which means an absolutely rigid support is given to that part of the holder which receives the strain of the cutting operation of the blade. It will also be noted that by depressing the upper face of the holder-head, which is accomplished by forming the head on the lower side only of the end of the stock, the tool can be held in a horizontal position and in line with the working center of a lathe; and that by so locating the tool in the same horizontal plane with the center of the work, a tool in the position as shown in Fig. 3, can be employed for inside boring or threading work; thus adapting the tool holder -for universal use in machines wherein the lathe-post is not vertically adjustable.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A tool-holder comprising a stock having a head on one side of its end, there being an axial aperture in the head and a countersink around the aperture in the face of the head and a lug intruding in the counter-sink; a post with a head adapted to be entered res ectively in the aperture and counter-sink, tliere being notches in the head adapted to engage the lug, and a slot in the post adapted to receive the tool; and a screw in the head adapted to be turned against the tool to bind the parts together.

2. In a tool-holder, a stock having a head on one end with a transverse aperture therein, a post inthe aperture having a slot adapted to receive a cutter-tool, there being a groove in one side of the slot and diametric grooves in the opposing face of the head adapted to receive the edges of a cutting-off tool, and means for binding the parts together.

3. In a tool holder, a stock having a head on one end, there being an axial aperture in the head with a countersink in one face of the head around the aperture and a lug intruding in the countersink; a post with a head adaptedto be entered respectively in the aperture and the countersink, there being notches in the head adapted toengage the lug, and a slot in the post adapted to receive a tool; and means for binding the parts together.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DAVID CRAIG.

Witnesses 1 MARY A. CAVANAUGH, JosEPH FREAsE. 

